7. Clio lucai spec. nov. is described from Early Pleistocene deposits in northern Italy. The new taxon is compared with related species, for most of which the subgenus Balantium may be revived. Characteristics of other Clio (Balantium) species, known from modern faunas as well as from the fossil record, are compared. Most features, however, develop independant of time and seem to be controlled mainly by ecological factors, thus offering little possibilities for the construction of an evolutionary lineage. Some ideas on a further subdivision of the genus Clio s.lat. are added. 8. A large species of Cavolinia from the Early Pliocene of New Zealand has been found to be assignable to C. grandis (Bellardi, 1873), originally described from the Zanclean of northern Italy. The same species is also known from Japan, and thus constitutes a ’first order longdistance correlation tool’. 9. A paratype of Limacina ferax (Laws, 1944) in the collection of the Geology Department (Otago University, Dunedin, New Zealand) has now proved to be assignable to Limacina atypica (Laws, 1944), described from the same locality and stratigraphic level.. The internal mould of the specimen demonstrates a clear margin-parallel constriction shortly behind the aperture, thus demonstrating the presence of apertural reinforcements in this species, which was hitherto believed to have a simple apertural margin.

, , , , , , , , , , ,

CC BY-NC 4.0 NL ("Naamsvermelding-NietCommercieel")

Nederlandse Malacologische Vereniging

Arie W. Janssen. (2000). Notes on the systematics, morphology and biostratigraphy of fossil holoplanktonic Mollusca, 7-9. 7, Clio lucai spec. nov. from the Plio/ Pleistocene of northern Italy, with notes on evolutionary lineages of the genus Clio; 8, Cavolinia grandis (Bellardi, 1873) from the Early Pliocene of New Zealand, a further example of long-distance correlation by means of pteropods; 9, apertural reinforcements in Limacina atypica (Laws, 1944) from the Miocene of New Zealand. Basteria, 64(1/3), 35–50.